What is the difference between :::: and 0.0.0.0 from the netstat -an output?

Question

I just want to understand the difference between :::: and 0.0.0.0. I believe both are same which let connection from outside if any processor is listening to that port.

udp        0      0 127.0.0.1:123               0.0.0.0:*
udp        0      0 0.0.0.0:123                 0.0.0.0:*
udp        0      0 :::32813                    :::*
tcp        0      0 :::5080                     :::*

Answer 1

As you have correctly identified, an IPv4 address of 0.0.0.0 is a "catch-all" listen address.

:: is the short-form of 0:0:0:0:0:0:0:0, which is the equivalent address in IPv6. The third colon separates this address from the port number.

This question has been asked on the web before¹.

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_{^1. discovered via a Google search for netstat colons}